Roller flour-mill



(N0 Mddel.)

W. A. MA'HAFPY.

ROLLER FLOUR MILL.

No. 263,927. Patented Sept. 5. 1882.

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ED STATES PATENT @rrrcn.

WILLIAM A. MAHAFFY, OF'RUSHFORD, MINNESOTA.

ROLL-ER, FLOUR-MILL.

SBEGIFICATION- forming part of Letters Patent No. 263,927, datedEeptember 5, 1882.-

Application filed January 16, 1882. (No model.)

T all whom it may concern:

Beit known that I,WILL1AM A. MAHAFFY, of Rushford, in thecou'nty ofFillmore and State of Minnesota, have invented a new and ImprovedItoller Flour-Mill and I do hereby declare that the following is afull,clear, andexact description of the same,reference being had to theaccompanying drawings, forming part of this specification, in which-Figure 1 is a side view from the side opposite the rolls,.showing theright-hand bearing of the right-hand set of rolls in section. Fig. 2 isa plan .view with one cross-piece i removed. Fig. 3 is a cross-sectionthrough the line w 00 of Fig. 4 is a detail of the device for tighteningthe belts,the pulleys being removed to show the eccentric bearing.

My invention relates to certain improveare employed for reducing thegrain. My improvement consists in the peculiar construction andarrangement of the adjusting devices for the laterally-movable roll, andin the means for locking said movable roll in working position, as willbe hereinafter more fully described.

In the drawings, A represents any suitable frame-work, in which aresustained two sets of reducingrolls, B B and O (3, (see Fig. 2,) whichsets are separated by a partition, D, so

' that two separate reductions may be made at one time. Just above theserolls is arranged the usual feed-boxes, (not shown), which may be of theusual form and function. For rotating these rolls pulleys E E arearranged on the extension of the journals of the rolls B U, and theseare connected with a driving-pulley, F, by belts G G. The other tworolls, B G, rotate passively from contact with the rolls B G.

The adjustable rolls B and 0 have each a similar or correspondingmechanism for controlling their movements, and a description of one ofthem will therefore suff ce for both. Each of these rolls is fixed upona shaft, a, projecting laterally from and journaled eccentrically in acircular boss or huh, I), turning loosely in a box, 0. This box 0 isarranged in a seat, d, so as to slide vertically for a slightadjustment, and has on its sides lugs e a, which rest in verticalgrooves f of the seat 01. This device prevents any endwise movement ofthe roll, and yet allows it to be adjusted vertically to raise or lowerits point of contact with the other roll. For giving this box itsvertical adjustment a tapered wedge-block, g, is seated in a notch inthe seat dimmediatel y below the box 0, and is arranged to be drawn inadirection parallel with the axis of the roll by a nut, g, on thethreaded end of the wedge. This wedge by raising or lowering pin 9adjusts vertically the box 0. 'For holding the boxc against any tendencyto rise a set-screw, h, passes through the cross-piece i at the top andbears against the top of the said box.

To cause the adjustable roll to be projected against the other roll, anarm, H, is rigidly attached to the hub b, and is arranged to be swung atright angles to the axis of the rolls to cause the eccentrically-locatedaxis a to approach or recede from the axis of the other roll. This arm Hfor the roll B has the same function as H on the other side for roll 0,and it is rigidly connected to huh I) in same way that H is, as shown inFig. 3. These arms H and H connect respectively with rods I 1, at--tached by joints to vertically-swinging levers J J, connected at theirtops by a parallel-motioned bar K. In attaching the rods I l to thelevers J J one of the latter is jointed above and the other below thefulcru ms of the levers, so that the one movement jot bar K producesupon both the rolls B and 0 the same efi'ect of throwing them againsttheir twin rolls by throwing the arms II H inward or of throwing themaway by throwing said arms. outward. In locating the joints 0 of therods and levers I and J they are so placed that when the bar K has itsextreme adjustment for bringing the rolls together, as shown in dottedlines, Fig. 1, these joints will be thrown into line with the fulcrumsof the levers, so that the advantages of the lock on the dead-center mayhe obtained for maintaining this closed adj ustmeut of the rolls.

It may happen sometimes when the rolls are thus locked in close contactthat unyielding foreign bodies may get between the rolls. To provide forthis, on the top of the arms 11 [1 may be formed ,tubes 9), one ofwhich, as shown on the left, whose outer ends are open and whose innerends are closed, with the exception of a central hole through which therod I passes. In the tube of each arm and around thesc'rods I I isarranged a spiral spring m, which at one end bears against the inner endof the tube, and at the other end bears against a nut, m screwed uponthe threaded end of the rod I, so that the strain of these rods on thearms H and H and their rolls is an elastic strain, which allows themovable rolls to yield slightly to foreign substances. Instead of a tubeand spiral spring, a rubber spring, as shown on the right, may be used.

For regulating the tension of the drivingbelts G G the pulley F is fixedon a countershaft below therolls, and the said shaft is eccentricallylocated in ahub, F, which latterturns in a box, F and is provided withan arm,F Figs. 1 and 4, rigidly attached thereto. This arm F is jointedat its end to a screw-rod, F which latter passes through a perforatedstandard or lug, r, and has nuts 8 s on opposite sides of the same, sothat by forcing the arm F down by the rod F and nuts 8 the hub F isturned on its axis and the pulley drawn down to tighten the belt.

In making use of my invention I do not confine myself to a solid boss orhuh, I), for carrying the axis a. of the movable roll, but I may make itwith a movable bearing-block, I), Fig. 1, which is held against theshaft a by setserew'b to take up wear, the set-screw being arrangedoutside of the peripheral bearing-surface of the boss, where it comes incontactwith the inclosing box. 7

- It will be perceived that I have only described means for adjustingone end of the shaft of the laterally-movable roll. The other end ofthis shaft in each of the adjustable rolls moves freely in a slot thelength of the hearing of the roll-shaft a in hub b, being long enough todispense with any separate adjustment of the other end.

Having thus described my invention, what I claim as new is- 1. Thecombination, with the roll B, of an adjustable roll B, shaft (1, the hubb, said shaft being eccentrically journaled in said hub, anadjusting-arm, H, the vertically-adjustable box c,'inclosing said hub,and the seat at for holding said box, substantially as and for thepurpose described.

2. The combination, with the laterally-ad justable rolls B O, the hubsI), having the roll-' shafts located eccentrically therein, and the arms11 H, attached to'said hubs, of the rods I and I, having an elasticconnection with said arms, the levers J J, jointed to the rods WILLIAMA. MAHAFFY.

Witnesses:

O. S. BERG, Tuos. MADLAND.

